Although not strictly speaking a design for British use, BAC did offer a version of the BAC 1-11 to Japan to fulfil their P-XL requirement to replace their licence-built Lockheed Neptune fleet, which was eventually filled by licence-manufacture of the Lockheed P-3. The 1-11 probably didn't stand much of a chance given the penetration of US manufacturers in Japan and the slightly lash-up nature of this design with a towed MAD and two booster engines added underwing.
The RAF by this time had the Nimrod, so no British use was likely.
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Klag, true but the E-3 was not a T-tail aircraft, the A-50 had some aerodynamic issues with the its randome affecting the early days. I think a lot of wind tunnel work would have been needed, though adding bulbous nose and tail randomes would have just as tricky and of course electronically difficult as the Nimrod 3 programme proved.